$colorByLetter: a #ff6b81, b #ff7f50, c #efc951, d #94cd53, e #57606f, f #ffa502, g #409d94, h #ff4757, i #747d8c,
  j #2f3542, k #c47367, l #70a1ff, m #6665e2, n #2c437e, o #60a3bc, p #2ed573, q #1e90ff, r #275a80, s #7e6a6a,
  t #5fc068, u #d03961, v #006266, w #833471, x #fda7df, y #12cbc4, z #4a69bd;

@each $pair in $colorByLetter {
  $letter: nth($pair, 1);
  $color: nth($pair, 2);

  .#{$letter} {
    background-color: $color;
  }
}
